According to the UN Charter, Article 9, "The General Assembly shall consist of all the Members of the United Nations"

According to the UN Charter, Article 23, "The Security Council shall consist of fifteen Members of the United Nations"; there are five permanent members and ten non-permanent members, five of which are elected each year by the General Assembly for a two-year term

According to UN Charter, Article 61, "The Economic and Social Council shall consist of fifty-four Members of the United Nations elected by the General Assembly"; eighteen Members are elected each year for a three-year term

According to the Statute of the International Court of Justice, Chapter I, Articles 2-33, the ICJ is composed of fifteen "independent judges, elected regardless of their nationality from among persons of high moral character, who possess the qualifications required in their respective countries for appointment to the highest judicial offices, or are jurisconsults of recognized competence in international law"; five members are elected every three years for nine year terms. The General Assembly and Security Council independently elect the judges and candidates must obtain an absolute majority in both organs

In accordance with the Charter, the General Assembly (Article 22), Security Council (Article 29) and the Economic and Social Council (Article 68) may establish subsidiary organs.The decision to establish a subsidiary organ (also called the mandate) usually includes:

Type of members: e.g. states or individuals serving in personal capacity

Number of members

Distribution of seats according to equitable geographical distribution among the regional groups

Articles 31-32 of the Charter concern participation in the Security Council by states.

Articles 69-71 of the Charter concern participation in the Economic and Social Council by states, specialized agencies and non-governmental organizations.

In addition, the General Assembly has an established practice of granting observer status to non-member states and intergovernmental organizations, see decision 49/426 in A/49/49 (Vol. I), page 341. Entities with observer status receive "a standing invitation to participate as observers in the sessions and the work of the General Assembly" (A/INF/73/5).

Regional Groups

Regional groups in the UN are groups of states that, among other discussions, coordinate nomination of candidates for election to various bodies.The major regional groups are the Group of African States, the Group of Asian States, the Group of Eastern European States, the Group of Latin American and Caribbean States, and the Group of Western European and Other States.